Buying Broadband - The saga part 3

Fullstop, customer lost.
I had a fairly simple question: Does my phoneline support 3.5 MBit ADSL. I thought I had expressed that question fairly clear and I had mentioned, that the support form does not work for prospective customers. However it seems my friendly support guy didn't get it:

" Dear Mr Wissel

Thank you for your email.

We have been advised by our Technical team that our offering does not warrant
that the services will be uninterrupted and/or error-free. For better
details, please refer to the webpage at
http://..removed to protect the not so innocent ...

We hope we have addressed your concerns. For further clarifications,
please reply to this email or you may visit our webpage at
http://..the url for existing customers to send
us an online feedback form.

We look forward to serving you."

How can they expect that I build up confidence if they can't answer a simple question?
Should I give it another try